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Analog Devices Inc. LTC1272-8CCSW#PBF
- Part No.:
- LTC1272-8CCSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1272-8CCSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,615
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Product details
Overview
LTC1272-8CCSW#PBF from Analog Devices (acquired Linear Technology) is a 12-bit, 8µs successive approximation ADC with on-chip sample-and-hold, single 5V supply operation, 0V–5V unipolar input range, and 2.42V internal reference - designed for high-speed data acquisition in embedded DSP and multiplexed systems.
For engineers reviewing the LTC1272-8CCSW#PBF datasheet, LTC1272-8CCSW#PBF pinout, LTC1272-8CCSW#PBF application, or LTC1272-8CCSW#PBF equivalent, this page delivers verified specs, real-world timing constraints (e.g., 1µs minimum inter-conversion delay), package-confirmed SO wide 24-pin layout, and two validated drop-in alternatives for AD7572-replacement scenarios.
Technical Context
The LTC1272-8CCSW#PBF implements a switched-capacitor SAR architecture with integrated 2.42V ±1% bandgap reference and curvature correction. It uses LTBiCMOS process technology to achieve 12-bit resolution without missing codes across its full operating temperature range (0°C to 70°C).
It supports both external TTL/CMOS clock (1.6MHz typical for -8 variant) and crystal oscillator modes (1.6MHz ceramic resonator). Its dual read modes - parallel 12-bit and two-byte 8-bit - are controlled by HBEN, enabling direct interfacing with 8-bit and 16-bit microprocessors without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for precision measurement applications. |
| Conversion Time | 8µs (LTC1272-8 variant) - enables up to 111kHz sustained sampling rate per datasheet Table "DYNAMIC ACCURACY". |
| Input Range | 0V to 5V unipolar - compatible with standard 5V logic and sensor outputs without level-shifting. |
| Reference Output | 2.42V ±1% (±25ppm/°C tempco) - factory-trimmed internal bandgap reference eliminates need for external voltage reference. |
| Supply Voltage | Single 5V (4.75V–5.25V) - simplifies power design versus dual-supply predecessors like AD7572. |
| Power Dissipation | 75mW typical - low thermal load suitable for dense PCB layouts and continuous acquisition. |
| S/(N+D) Ratio | 72dB at 10kHz input - corresponds to 11.5 ENOBs at 250kHz sampling, confirming usable dynamic range for audio and baseband signals. |
Pinout & Package
Package: 24-lead plastic SO wide (SW), RoHS-compliant lead-free finish (#PBF), JEDEC MS-013AC footprint, 0°C to 70°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | 0V–5V unipolar signal input; requires <1µs settling after 300Ω/2.7kΩ divider-induced current spike. |
| VREF (2) | Reference Output | 2.42V ±1% output; must be decoupled with 10µF tantalum + 0.1µF ceramic to minimize code transition noise. |
| AGND (3) | Analog Ground | Single-point analog ground reference; must be isolated from DGND except at star point near device. |
| D11–D4 (4–11) | Data Outputs (MSB–D4) | Three-state outputs; active when CS and RD low; D11 is MSB of 12-bit result. |
| DGND (12) | Digital Ground | Digital return path; connected to system digital ground plane, separate from AGND except at star point. |
| D3/11–D0/8 (13–16) | Data Outputs (D3–D0 / Multiplexed MSBs) | HBEN-controlled: when HIGH, outputs D11–D8 on D3/11–D0/8 for byte-read mode; when LOW, outputs DB3–DB0. |
| CLK IN (17) | Clock Input | Accepts 1.6MHz external TTL/CMOS clock or drives 1.6MHz crystal between CLK IN/CLK OUT pins. |
| CLK OUT (18) | Clock Output | Inverted CLK IN signal; capacitance here must be minimized to prevent analog feedthrough. |
| HBEN (19) | High-Byte Enable | Controls data bus multiplexing: LOW = full 12-bit parallel; HIGH = D11–D8 appear on D3/11–D0/8 for 8-bit reads. |
| RD (20) | Read Input | Active-low control that initiates conversion when CS and HBEN are also low; enables output drivers. |
| CS (21) | Chip Select | Active-low enable for RD/HBEN recognition; must be held low during conversion and read cycles. |
| BUSY (22) | Busy Indicator | Active-low open-drain output signaling conversion in progress; used for polling or interrupt generation. |
| NC (23) | No Connect | Internally unconnected; accommodates AD7572's –15V pin without damage; must remain floating or tied to GND. |
| VDD (24) | Positive Supply | 5V ±2.5% supply; bypassed with 0.1µF ceramic close to pin; powers analog and digital sections. |
Key Features
| Feature | Design Value |
|---|---|
| AD7572 pin-compatible replacement | Same 24-pin SO wide footprint and signal mapping - allows socket-level upgrade with only capacitor polarity reversal at VREF. |
| On-chip sample-and-hold | Integrated S&H with 0.45–1µs acquisition time - eliminates external S&H IC and reduces board area/cost. |
| Single 5V supply operation | No negative supply required (NC pin replaces AD7572's –15V pin) - simplifies power architecture and reduces BOM count. |
| ESD protection on all pins | Robustness against >2kV HBM - improves manufacturing yield and field reliability in handling-sensitive environments. |
| Two read interface modes | Parallel 12-bit or two-byte 8-bit via HBEN - enables seamless integration with legacy 8-bit microcontrollers and modern 16-bit processors. |
Applications
| Industrial Data Acquisition | DSP-Based Signal Processing |
|---|---|
|
Use Scenario: Real-time monitoring of motor phase currents and temperature sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Primary sampling ADC capturing synchronized multi-channel analog inputs at ≤111kHz with deterministic 8µs conversion latency. Use Value: Eliminates need for external reference and S&H, reducing component count by ≥3 while maintaining 12-bit linearity (±1 LSB INL). |
Use Scenario: Digitizing audio-band sensor outputs (e.g., vibration, acoustic emission) for FFT-based spectral analysis in predictive maintenance edge nodes. IC Role / Device Role / Timing Role: High-fidelity front-end ADC delivering 72dB S/(N+D) at 10kHz input - directly feeding 1024-point FFT engine. Use Value: On-chip 2.42V reference and low-noise SAR architecture ensure stable ENOB ≥11.5 up to 20kHz, avoiding external calibration. |
| Multiplexed Sensor Systems | Single-Supply Embedded Instrumentation |
|
Use Scenario: 16-channel thermocouple and RTD measurement system using analog multiplexer before ADC input. IC Role / Device Role / Timing Role: Central ADC accepting time-multiplexed inputs; 1µs minimum inter-conversion delay allows rapid channel cycling. Use Value: Low 3.5mA analog input current and 50pF input capacitance minimize crosstalk and settling burden on multiplexer driver stage. |
Use Scenario: Portable battery-powered oscilloscope front-end requiring minimal external components and low quiescent power. IC Role / Device Role / Timing Role: Standalone 12-bit digitizer operating from single Li-ion cell (via 5V boost) with no auxiliary supplies or references. Use Value: 75mW typical power and integrated reference reduce total solution size and extend runtime versus discrete reference + ADC solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7572KNZ | Slower 15µs conversion time; requires ±5V/–15V dual supply; –5.25V reference output; no on-chip S&H. | Legacy industrial designs where dual supply exists and speed <100kHz suffices; not suitable for single-supply upgrades. | Select only if backward compatibility with existing AD7572 hardware is mandatory and performance margin allows. |
| LTC1273CSW#PBF | Same pinout/package; 3µs conversion (vs. 8µs); higher 250kHz max sample rate; identical 2.42V reference and S&H. | Applications needing faster throughput (e.g., real-time control loops, wider bandwidth sensing) without changing layout. | Drop-in speed upgrade: same footprint, same reference, same interface - replace LTC1272-8CCSW#PBF with no redesign. |
Compared with AD7572KNZ, LTC1272-8CCSW#PBF delivers single-supply operation and integrated S&H at higher speed; compared with LTC1273CSW#PBF, it trades 3µs speed for lower power and relaxed timing margins - making it optimal for cost-sensitive, moderate-throughput instrumentation.
Availability
LTC1272-8CCSW#PBF is available at Aetrix Electronics and suitable for industrial data acquisition, DSP-based signal processing, and multiplexed sensor systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1272-8CCSW#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) acquired Linear Technology in 2017 and maintains full technical and supply chain continuity for all Linear-branded precision analog products.
The LTC1272-8CCSW#PBF belongs to Linear's legacy high-speed precision SAR ADC family, engineered specifically for drop-in replacement of industry-standard converters like AD7572 while enabling simpler, single-supply system architectures.
FAQ
What is the maximum sampling rate achievable with the LTC1272-8CCSW#PBF?
The LTC1272-8CCSW#PBF achieves a maximum sustained sampling rate of 111kHz, derived from its 8µs conversion time plus minimum 1µs inter-conversion delay (t11). This is confirmed in the "DYNAMIC ACCURACY" table of the datasheet under fSAMPLE = 111kHz for the LTC1272-8 variant. The rate assumes proper clock synchronization and adequate analog input settling.
Does the LTC1272-8CCSW#PBF require an external reference voltage?
No, the LTC1272-8CCSW#PBF does not require an external reference voltage. It integrates a factory-trimmed 2.42V ±1% bandgap reference with ±25ppm/°C tempco, available at Pin 2 (VREF). This internal reference directly drives the DAC and can source up to 1mA, eliminating external reference components in most designs.
Can the LTC1272-8CCSW#PBF be used as a direct replacement for the AD7572 in existing PCBs?
Yes, the LTC1272-8CCSW#PBF is pin-compatible with the AD7572 and can be plugged into the same socket, but two modifications are required: reverse the polarity of the VREF bypass capacitor (due to +2.42V vs. –5.25V reference), and leave Pin 23 (NC) unconnected instead of applying –15V. No PCB layout change is needed beyond those adjustments.
What are the key timing requirements for reliable read operations with the LTC1272-8CCSW#PBF?
Reliable read operations require adherence to t2 (RD to BUSY delay ≤230ns), t3 (data access time ≤110ns at CL=100pF), and t10 (minimum 200ns delay between RD pulses). Critically, t11 mandates ≥1µs between conversions to allow full analog input acquisition. These values are specified for commercial grade (0°C–70°C) and verified in the "TIMING CHARACTERISTICS" section.
How does the HBEN pin affect data output formatting on the LTC1272-8CCSW#PBF?
The HBEN pin controls data bus multiplexing: when LOW, all 12 bits (DB11–DB0) appear on D11–D4 and D3/11–D0/8 for parallel read; when HIGH, only the 4 MSBs (DB11–DB8) appear on D3/11–D0/8, while D7–D4 go LOW - enabling two sequential 8-bit reads (first low byte, then high nibble) for 8-bit microprocessor interfaces.
LTC1272-8CCSW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1272-8CCSW#PBF FAQ
1.How can I place an order for LTC1272-8CCSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1272-8CCSW#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC1272-8CCSW#PBF reliable?
The price and inventory of LTC1272-8CCSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1272-8CCSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1272-8CCSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1272-8CCSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1272-8CCSW#PBF?
LTC1272-8CCSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1272-8CCSW#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC1272-8CCSW#PBF?
For technical support, including LTC1272-8CCSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1272-8CCSW#PBF requirements.
6.How does Aetrix verify that LTC1272-8CCSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1272-8CCSW#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1272-8CCSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1272-8CCSW#PBF?
All LTC1272-8CCSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1272-8CCSW#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC1272-8CCSW#PBF part is unused and in its original packaging.
Return procedure for LTC1272-8CCSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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